Podcast
Questions and Answers
What is a first class lever?
What is a first class lever?
- The fulcrum is at one end.
- It has no mechanical advantage.
- The load is between the fulcrum and the effort force.
- The fulcrum is in the middle between the effort force and the resistance arm. (correct)
Define a lever.
Define a lever.
A beam on a fulcrum that allows smaller force to move more weight.
Give examples of first class levers.
Give examples of first class levers.
Scissors, can opener.
What is a second class lever?
What is a second class lever?
Provide examples of second class levers.
Provide examples of second class levers.
Calculate the mechanical advantage (MA) where LE=30 cm and LR=10 cm.
Calculate the mechanical advantage (MA) where LE=30 cm and LR=10 cm.
What is the mechanical advantage formula?
What is the mechanical advantage formula?
Describe a third class lever.
Describe a third class lever.
Give examples of third class levers.
Give examples of third class levers.
Calculate the mechanical advantage (MA) where LR=80 cm and LE=20 cm.
Calculate the mechanical advantage (MA) where LR=80 cm and LE=20 cm.
What is the formula for torque?
What is the formula for torque?
Define torque.
Define torque.
What is the torque produced when a mechanic pulls on a 6-inch wrench with a force of 100 lbs?
What is the torque produced when a mechanic pulls on a 6-inch wrench with a force of 100 lbs?
What is the law of moments formula?
What is the law of moments formula?
Calculate effort moments (ME) if the effort arm length (LE) is 153.5 in and the effort force (FE) is 63.5 lbs.
Calculate effort moments (ME) if the effort arm length (LE) is 153.5 in and the effort force (FE) is 63.5 lbs.
Determine the torque for a lever with a distance of 11.8 in and a force of 68.3 lbs-f.
Determine the torque for a lever with a distance of 11.8 in and a force of 68.3 lbs-f.
What is a fulcrum?
What is a fulcrum?
What is the effort force?
What is the effort force?
What is the resistance force?
What is the resistance force?
If you change the _____, then the torque changes.
If you change the _____, then the torque changes.
Flashcards
First-Class Lever
First-Class Lever
The fulcrum is positioned between the effort and resistance forces.
Lever
Lever
A beam that pivots on a fulcrum, enabling a smaller force to move a larger load.
Second-Class Lever
Second-Class Lever
The resistance (load) is located between the fulcrum and the effort force.
Third-Class Lever
Third-Class Lever
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Mechanical Advantage (MA)
Mechanical Advantage (MA)
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Fulcrum
Fulcrum
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Effort Force
Effort Force
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Resistance Force
Resistance Force
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Torque
Torque
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Torque Formula
Torque Formula
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Effort Arm
Effort Arm
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Resistance Arm
Resistance Arm
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Law of Moments
Law of Moments
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Mechanical Advantage Calculation
Mechanical Advantage Calculation
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Distance Effect on Torque
Distance Effect on Torque
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First-Class Lever Examples
First-Class Lever Examples
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Second-Class Lever Examples
Second-Class Lever Examples
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Third-Class Lever Examples
Third-Class Lever Examples
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Study Notes
Levers Overview
- Levers consist of a beam resting on a fulcrum, allowing a smaller force to lift a larger weight.
- There are three classes of levers, each defined by the position of the fulcrum, effort, and load.
First Class Lever
- The fulcrum is positioned between the effort force and the resistance arm.
- Examples include scissors and can openers.
Second Class Lever
- The load is positioned between the fulcrum and the effort force.
- Examples include nut crackers and wheelbarrows.
- Mechanical Advantage (MA) can be calculated using the formula: MA = LE/LR, where LE = Load Effort, LR = Load Resistance.
- Example problem: If LE = 30 cm and LR = 10 cm, MA = 3.
Third Class Lever
- The effort force is located between the fulcrum and the load, resulting in no mechanical advantage.
- Examples include bats and brooms.
- Example problem: If LR = 80 cm and LE = 20 cm, MA = 20/80 = 0.25.
Torque
- Defined as "Moment of Force," it refers to the rotational force applied around a pivot point.
- Formula for torque: T = F x L, where T is torque (in-lbs), F is force (lbs-f), and L is distance (in).
- Example problem: A mechanic pulling on a 6-inch wrench with a force of 100 lbs results in T = 6 * 100 = 600 in-lbs.
Law of Moments
- The relationship is given by the formula: ME = FE x LE.
- ME = Effort Moments (in-lbs), FE = Effort Force (lbs), LE = Effort Arm Length (in).
- Example problem: For a first class lever with LE = 153.5 in and FE = 63.5 lbs, ME = 153.5 x 63.5.
Key Terms
- Fulcrum: The fixed point around which a lever pivots.
- Effort Force: The force applied to implement the lever's operation.
- Resistance Force: The force that the lever is working against.
- Changing the distance affects the torque generated by a lever.
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